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Bifold Door Roller Replacement For bifold doors They are constructed from stainless steel, and are resistant to wear and breakage for a long-term use. They are sturdy enough to support your door's weight and are easy-to-install. This nylon roller guide for the top is designed to replace bi-fold door panels that weigh up to 30 pounds. It can be used with aluminum profiles of System S1000. How do you identify a broken bifold door roller Bifold door